Tarantulas are indeed found in Wyoming. This article clarifies their presence, characteristics, and seasonal patterns for those who might encounter these large, hairy arachnids.
Tarantulas in Wyoming
Tarantulas are found in Wyoming, with the primary species being Aphonopelma hentzi, also known as the Texas brown tarantula. This species is widely distributed across the southern United States, with its range extending northward into southeastern Colorado and into parts of Wyoming. These tarantulas typically inhabit drier grasslands and scrublands, utilizing burrows for shelter. While not as abundant as in some southern states, their presence in Wyoming is part of their natural geographic spread.
Wyoming Tarantula Behavior
The Aphonopelma hentzi is a terrestrial species, known for its generally docile nature. Adults can reach a leg span of 4 to 5 inches (10-12.5 cm) and typically have a dark brown body, though shades can vary. They are primarily nocturnal, spending most of their time in burrows underground, which they often line with silk to detect passing prey. If disturbed, this species is more likely to retreat or display a defensive posture by raising its front legs.
As a defense mechanism, Aphonopelma hentzi possesses urticating hairs on its abdomen, which it can flick off when threatened. These fine, barbed hairs can cause irritation to skin and mucous membranes. While they possess venom, a bite is generally mild and not medically significant to humans, often compared to a bee sting. Such bites are rare, as these spiders prefer to avoid confrontation.
Understanding Seasonal Sightings
Tarantulas are most commonly observed in Wyoming during late summer and early fall, particularly from August through October. This increased visibility is due to the dispersal of mature male tarantulas. Males, having reached sexual maturity, leave their burrows in search of females to mate.
This search for mates involves males wandering across landscapes, sometimes covering significant distances, which makes them more noticeable, especially on roads and open areas. Female tarantulas, on the other hand, typically remain in or near their burrows, emitting pheromones to attract males. After mating, male tarantulas typically live only a few more months, while females can live for many years, sometimes decades. If you encounter a tarantula during these months, it is advisable to observe it from a distance and avoid handling it, allowing it to continue its natural journey.